Spray nozzle

ABSTRACT

A nozzle for mixing a stream of pressurized viscous material, such as cold liquid asphalt, with pressurized air and thereby discharging the viscous liquid material in a fine spray for coating a surface such as the roof of a building.

United States Patent [72] Inventor Myron F. Goff [56] References Cited 6404 Thelma, RR #4, Antwerp UNITED STATES PATENTS 2 l A l N IZI'S 'X 1,872,058 8/1932 Bramsen et al. 239/4164 i Sept 24 1968 2,530,269 11/1950 Smith 239/431 I45] Patented Jan. 26 197] 2,965,312 12/1960 Hale 239/430X Primary Examiner-M. Henson Wood, Jr. Assistant Examiner-Michael Y. Mar [54] SPRAY N ZZLE Attorney-Woodhams, Blanchard and Flynn 6 Claims, 4 Drawing Figs.

[52} US. Cl 239/425,

239/431 ABSTRACT: A nozzle for mixing a stream of pressurized [51] int. Cl B05b 7/06 viscous material, such as cold liquid asphalt, with pressurized [50] Field of Search 239/424, air and thereby discharging the viscous liquid material in a fine @l/IA 5,. If. I Q IIIIIIIIIIIIIIIIIQ manta 4 spray for coating a surface such as the roof of a building.

SPRAY NOZZLE This application is related to my copending application Ser. No. 650,794, filed July 3, I967 and the application of Casper Goff, Ser. No. 775,310.

FIELD OF THE INVENTION This invention relates to a nozzle and, more particularly, to a type thereof for mixing a stream of pressurized viscous liquid material with pressurized air to produce a relatively fine spray of the liquid material.

BACKGROUND OF THE INVENTION This invention arose out of a need for a nozzle which would effectively apply a viscous liquid material, such as cold asphalt, onto a surface, such as a roof, in a uniform, fine spray having a wide angle of discharge. The process, of which this spraying operation is a part, is explained in detail in my copending application Ser. No. 650,794, filed July 3, I967.

Nozzles which were commercially available on the market were not completely satisfactory due to the fact that they were incapable of satisfactorily dispersing the viscous materials, and they plugged up too quickly. Furthermore, the commercially available spray nozzles are not capable of discharging large volumes of viscous material in the desired spray pattern. Some nozzles permitted the flow of a large volume of viscous material, but the viscous material was not effectively broken up into small droplets as the material discharged from the nozzle. Thus, they have not been effective in laying a thin layer of cold asphalt material onto a roof.

Accordingly, it is a primary object of this invention to provide a nozzle which is capable of handling large volumes of viscous material, and which is capable of discharging the material in a wide uniform spray of small droplets so that the viscous material is effectively dispersed in a thin even layer on a surface.

It is a further object of this invention to provide a nozzle, as aforesaid, which is simple to manufacture through the utilization of readily available parts, which is easy to disassemble for cleaning purposes and which will not plug up so that cleaning and maintenance thereof is minimized.

Other objects and purposes of this invention will be apparent to persons acquainted with apparatus of this general type upon reading the following specification and inspecting the accompanying drawings, in which:

FIG. 1 is a schematic illustration of the circuit for supplying pressurized viscous liquid and pressurized air to a nozzle of the type embodying the invention;

FIG. 2 is a top view of the nozzle taken along the line ll-II of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is a sectional view a taken along the line IV-lV of FIG. 3.

Certain terminology will be used in the following description for convenience in reference only and will not be limiting. The words right and left" will designate directions in the drawing to which reference is made. The words in" and out" will refer to directions toward and away from, respectively, the geometric center of the device and designated parts thereof. Said terminology will include the words thereof specifically mentioned, derivatives thereof and words of similar import.

SUMMARY OF THE INVENTION The objects and purposes of the invention have been met by providing a nozzle having an elongated hollow body with first and second inlet openings connected to an outlet opening. An

elongated tubular member extends coaxially through-the outlet opening and into the first inlet opening, and the viscous material moves from the second inlet opening through the tubular member. The exterior surface of the tubular member and the wall defining the outlet opening are spaced between their ends to provide a cylindrical passageway through whic flows the pressurized air from the second inlet opening. A least one radial opening is provided in the tubular member at jacent the outlet end thereof to interconnect the tubulz member with said passageway, whereby to permit the flow r pressurized air into the stream of viscous liquid just before it discharged.

DETAILED DESCRIPTION The system 10 (FIG. 1) for supplying pressurized viscoL liquid material to the nozzle II will be briefly describe primarily to provide a disclosure of one type of environment i which the nozzle is capable of use. The system 10 comprises pumping device 12 which moves viscous liquid material, suc as cold asphalt, from a source 17 through a conduit 13 to control device 14 and thence to thenozzle 11. The pumpin device 12 is driven hydraulically by a power device 16 whic supplies hydraulic fluid through the conduit 26 thereto cau: ing the internal mechanism of the pumping device to draw th highly viscous material from the tank 17 and deliver sam under pressure to the conduit 13. A valve device 18 is cor nected to the conduit 26 by conduit 27 and to the reservoir 3 by the conduit 29, whereby hydraulic fluid can be caused t bypass the pumping device 12.

Pressurized air is generated in the compressor device 19 an is supplied through a conduit 21 to a variable chamber a; paratus 22 which has a piston 23 slideably disposed therei and a rod 24 connecting the piston 23 to the valve device It A conduit 25 interconnects the variable chamber apparatt 22 with the control device 14 which controls the volume pressurized air being delivered to the nozzle 11. The conduit 21 and 25 communicate with the variable chamber apparatt 22 on the same side of the piston 23, whereby a sudden ir crease in air pressure will cause the valve device 18 to bypa: the hydraulic fluid.

The nozzle 11 (FIGS. 24) comprises a hollow body 3 having a cylindrical recess 32 in one end thereof, the wa thereof being threaded at 33. A pair of cylindrical openings 3 and 37 are provided in the opposite end of the body 31. Th opening opening 37 communicates with one side of the rece: 32 adjacent the inner end thereof. A threaded passageway 3 connects the opening 36 with the recess 32. The passagewa 38 is coaxial with the recess 32 and of lesser diameter.

A pair of conduits 41 and 42 are threadedly connected wit threads in the walls defining the openings 36 and 37, respet tively, and they connect the control device 14 to the nozzl 11. In this particular embodiment, the conduit 41 is connecte through the control device 14 to the conduit 13 and the col duit 42 is connected to the conduit 25. The conduits 41 and 4 are preferably stiff and of substantial length so as to space th control device from the nozzle 11. Thus, the operator direc the nozzle by holding the control device in his hand, and h will be spaced a considerable distance from the noule 11 s that the material can be discharged conveniently from th nozzle near the roof surface and will not splatter onto th operator. The conduits 4! and 42 are in the range of 3 to feet long.

A tubular member 43 has an external thread 44 adjacei one end which is threadedly engaged with the threads in th passageway 38 so that the interior 46 of the tubular membt 43 communicates with the opening 36 and conduit 41. It recognized, of course, that the passageway 38 could t machined to a predetermined dimension and not have threat thereon so that one end of the tubular member could be hel I therein by a press fit. A plurality of openings 47 are provide d member 51 is of a greater diameter than the external meter of the tubular member 43 so as to define an annular ssageway 54 therebetween which communicates with the :ess 32, opening 37 and conduit 42. The wall 50 defining the mt end of the passageway 54 adjacent the front end of the d member 51 is beveled at 56 and in fluidtight engagement th the beveled surface 48 on the tubular member 43 so as to event the flow of air between the end of the tubular member and the beveled surface 56. A discharge aperture 57 is proled in the front end wall of the end member 51, and the mbined air and liquid are urged through the aperture 57, llCll may be varied in size and/or shape to accommodate riations in viscosity or discharge pattern.

OPERATION The operation of the device embodying the invention will be parent from the foregoing description, but will be sumirized hereinbelow for convenience. lt is contemplated that the operator will hold the control vice 14 in his hand for controlling the volume of pressurized cous asphalt material and pressurized air being delivered to nozzle 11. The control device I4 is rendered operable by control button indicated schematically at B. Assuming that operator has operated the button B to permit the flow of :ssurized asphalt liquid and pressurized air to the nozzle 11 'ough the conduits 41 and 42, respectively, the asphalt uid will flow into the opening 36, thence through the interi- 46 of the hollow member 43 and be discharged through the erture 57 in the end member 51. Pressurized air will pass 'ough the opening 37, recess 32, annular passageway 54 and :nce through the openings 47 into the stream of the viscous )halt liquid flowing through the tubular member 43. The :ssurized air is at a greater pressure than the pressure on the )halt liquid so that no asphalt will be backed up into the anlar passageway 54. The air entering the tubular member 43 l effectively break the viscous asphalt liquid into small )plets so that as the liquid asphalt and air are discharged ough the aperture 57 in a diverging stream of small droplets liquid asphalt which will be uniformly deposited upon sur- :es at which the aperture 57 is directed. Since the tubular mm member 43 provides a straightough connection between the opening 36 and the aperture a large volume of liquid asphalt is permitted to pass :rethrough without clogging the nozzle. Furthermore, the roduction of pressurized air into the stream of asphalt liquid acent the nozzle 57 creates an effective turbulence at the :rture 57 to effectively break up any particles which tend to rig to the internal surfaces surrounding the aperture 57. Still ther, since the beveled face 48 is disposed in fluidtight en- ;ement with the beveled face 56 of the front wall 50, the air mot flow directly from passageway 54 to aperture 57 but her must flow radially inwardly through the openings 47 so to become effectively entrained with the liquid asphalt. As openings 47 are disposed adjacent the discharge aperture, air causes the discharged asphalt to thus be rapidly iarated into a diverging stream of small droplets. lhe nozzle 11 is comprised of only three simple pieces ich can be quickly disassembled for cleaning, if desired, 1 the outer surface of the front end of member 51 can be irled to facilitate such disassembly. Although a particular preferred embodiment of the inven- 1 has been disclosed above for illustrative purposes, it will understood that variations or modifications of such discloe which lie within the scope of the appended claims, are y contemplated. claim: A nozzle for mixing a stream of pressurized gas with a :am of pressurized liquid and discharging the mixture, comung: igid body means having a first passageway extending therethrough, the rear end of said first passageway being connectable to a source of liquid under pressure, said first passageway having inlet and outlet portions disposed at angles to each other, the front part of said outlet portion being defined by tubular means;

wall means defining passage means in said body means spaced radially from said first passageway near the front end thereof, said passage means being annular and concentrically encircling said tubular means;

means defining at least one opening communicating between said first passageway and said passage means adjacent said front end of said first passageway;

wall means defining a second passageway in said body means communicating at one end of said passage means and connectable at its other end to a source of pressurized gas, said second passageway being substantially parallel with and spaced from the inlet portion of said first passageway;

said body means including a main body part containing the inlet portion of said first passageway, the rear part of the outlet portion of said first passageway, the second passageway and a recess defining the rear end of said passage means, said rear part of said outlet portion of said first passageway being of lesser diameter than the diameter of the adjacent end of said recess;

a cylindrical part firmly and partially received into said recess and having a coaxial opening defining the outer limits of the front end of said passage means;

said tubular means being in liquidtight engagement at its front end with said cylindrical part and at its rear end with the walls defining said rear part of said outlet portion of said first passageway; and

whereby the gas moves through the second passageway and through said passage means and through said opening and mixes with the liquid contained in said first passageway, the liquid-air mixture being discharged through the front end of said first passageway.

2. A nozzle according to claim 1, wherein said cylindrical 3. A nozzle structure for mixing a stream of pressurized fluid, particularly gas, with a stream of pressurized liquid and for discharging the resulting mixture, comprising:

rigid body means having a first passageway extending therethrough, said first passageway having inlet and discharge openings adjacent the opposite ends thereof, said inlet opening being connectable to a source of a first pressurized fluid;

wall means defining a second passageway in said body means spaced radially from said first passageway near the front end thereof;

wall mean means defining a third passageway in said body means and communicating at one end thereof with said second passageway and connectable at its other end to a source of a second pressurized fluid;

said third passageway being connected to said second passageway substantially adjacent one end of said second passageway, the other end of said second passageway being closed; and

means defining a small opening means for providing the sole communication between said first and second passageways, said opening means being disposed closely adjacent said discharge opening and being spaced slightly rearwardly therefrom for providing communication between the forward portion of said first passageway and the forward end of said second passageway, whereby all of the second pressurized fluid supplied to said second passageway must flow through said opening means so as to mix with the first pressurized fluid in said first passageway prior to discharge of said mixture through said discharge opening, the mixture of said fluids taking place directly adjacent said discharge opening for creating an effective turbulence at the discharge opening so as to effectively separate the liquid into individual particles.

4. A nozzle structure according to claim 3, wherein said body means includes a first tubular portion having an opening therein defining the outlet portion of said first passageway, said body means further including a second tubular portion disposed in surrounding relationship to said first tubular portion and radially spaced therefrom so as to define an annular space disposed in concentric encircling relationship to said first tubular portion, said annular space constituting said second passageway, the forward ends of said first and second tubular portions being disposed in fluidtight sealing engagement with one another for closing the forward end of said second passageway, and said opening means including at least one small opening extending radially through the wall of said first tubular portion closely adjacent the forward end thereof for permitting the second fluid to flow from said second passageway into said first passageway.

5. A nozzle structure according to claim 3, wherein said body means includes a main body part having an inlet portion of said first passageway formed therein;

said main body part further havinga tubular portion fixedly secured thereto with the open interior of said tubular portion defining the outlet portion of said first passageway; said body means further including a removable end member fixedly secured to the forward end of said me main body part, said end member being disposed in surrounding relationship to the forward end of said tubular portion, said tubular portion and said end member having opposed walls spaced from one another so as to define said second passageway therebetween, said third passageway beir formed in said main body part and being in communic tion with said second passageway; said end member and said tubular portion each having wal thereon adjacent the forward ends thereof with said wal being disposed in fluidtight sealing engagement with or another for effectively closing the forward end of sa second passageway, said opening means including at lea one small opening extending radially through the wall I v said tubular portion directly adjacent the discharge en thereof for providing communication from said secon passageway directly into said first passageway substar tially adjacent the discharge end thereof.

6. A nozzle structure according to claim 5, wherein said en member comprises a hollow cylindrical part disposed in su rounding relationship to the forwardmost end of said tubula portion, said cylindrical part having the rearward end lhf fixedly connected to said main body part, the other end of sai cylindrical part having cylindrical wall means disposed in su rounding relationship to and closely adjacent the forward en of said tubular portion, said cylindrical wall means having sai discharge opening formed therein, and said cylindrical wa means and the forward end of said tubular portion each havin annular surfaces disposed in fluidtight sealing engagemer with one another when the cylindrical part is fixedly secure to the main body part. 

1. A nozzle for mixing a stream of pressurized gas with a stream of pressurized liquid and discharging the mixture, comprising: rigid body means having a first passageway extending therethrough, the rear end of said first passageway being connectable to a source of liquid under pressure, said first passageway having inlet and outlet portions disposed at angles to each other, the front part of said outlet portion being defined by tubular means; wall means defining passage means in said body means spaced radially from said first passageway near the front end thereof, said passage means being annular and concentrically encircling said tubular means; means defining at least one opening communicating between said first passageway and said passage means adjacent said front end of said first passageway; wall means defining a second passageway in said body means communicating at one end of said passage means and connectable at its other end to a source of pressurized gas, said second passageway being substantially parallel with and spaced from the inlet portion of said first passageway; said body means including a main body part containing the inlet portion of said first passageway, the rear part of the outlet portion of said first passageway, the second passageway and a recess defining the rear end of said passage means, said rear part of said outlet portion of said first passageway being of lesser diameter than the diameter of the adjacent end of said recess; a cylindrical part firmly and partially received into said recess and having a coaxial opening defining the outer limits of the front end of said passage means; said tubular means being in liquidtight engagement at its front end with said cylindrical part and at its rear end with the walls defining said rear part of said outlet portion of said first passageway; and whereby the gas moves through the second passageway and through said passage means and through said opening and mixes with the liquid contained in said first passageway, the liquid-air mixture being discharged through the front end of said first passageway.
 2. A nozzle according to claim 1, wherein said cylindrical part and said tubular means are threadedly connected to and readily separable from said main part.
 3. A nozzle structure for mixing a stream of pressurized fluid, particularly gas, with a stream of pressurized liquid and for discharging the resulting mixture, comprising: rigid body means having a first passageway extending therethrough, said first passageway having inlet and discharge openings adjacent the opposite ends thereof, said inlet opening being connectable to a source of a first pressurized fluid; wall means defining a second passageway in said body means spaced radially from said first passageway near the front end thereof; wall mean means defining a third passageway in said body means and communicating at one end thereof with said second passageway and connectable at its other end to a source of a second pressurized fluid; said third passageway being connected to said second passageway substantially adjacent one end of said second passageway, the other end of said second passageway being closed; and means defining a small opening means for providing the sole communication between said first and second passageways, said opening means being disposed closely adjacent said discharge opening and being spaced slightly rearwardly therefrom for providing communication between the forward portion of said first passageway and the forward end of said second passageway, whereby all of the second pressurized fluid supplied to said second passageway must flow through said Opening means so as to mix with the first pressurized fluid in said first passageway prior to discharge of said mixture through said discharge opening, the mixture of said fluids taking place directly adjacent said discharge opening for creating an effective turbulence at the discharge opening so as to effectively separate the liquid into individual particles.
 4. A nozzle structure according to claim 3, wherein said body means includes a first tubular portion having an opening therein defining the outlet portion of said first passageway, said body means further including a second tubular portion disposed in surrounding relationship to said first tubular portion and radially spaced therefrom so as to define an annular space disposed in concentric encircling relationship to said first tubular portion, said annular space constituting said second passageway, the forward ends of said first and second tubular portions being disposed in fluidtight sealing engagement with one another for closing the forward end of said second passageway, and said opening means including at least one small opening extending radially through the wall of said first tubular portion closely adjacent the forward end thereof for permitting the second fluid to flow from said second passageway into said first passageway.
 5. A nozzle structure according to claim 3, wherein said body means includes a main body part having an inlet portion of said first passageway formed therein; said main body part further having a tubular portion fixedly secured thereto with the open interior of said tubular portion defining the outlet portion of said first passageway; said body means further including a removable end member fixedly secured to the forward end of said me main body part, said end member being disposed in surrounding relationship to the forward end of said tubular portion, said tubular portion and said end member having opposed walls spaced from one another so as to define said second passageway therebetween, said third passageway being formed in said main body part and being in communication with said second passageway; said end member and said tubular portion each having walls thereon adjacent the forward ends thereof with said walls being disposed in fluidtight sealing engagement with one another for effectively closing the forward end of said second passageway, said opening means including at least one small opening extending radially through the wall of said tubular portion directly adjacent the discharge end thereof for providing communication from said second passageway directly into said first passageway substantially adjacent the discharge end thereof.
 6. A nozzle structure according to claim 5, wherein said end member comprises a hollow cylindrical part disposed in surrounding relationship to the forwardmost end of said tubular portion, said cylindrical part having the rearward end thereof fixedly connected to said main body part, the other end of said cylindrical part having cylindrical wall means disposed in surrounding relationship to and closely adjacent the forward end of said tubular portion, said cylindrical wall means having said discharge opening formed therein, and said cylindrical wall means and the forward end of said tubular portion each having annular surfaces disposed in fluidtight sealing engagement with one another when the cylindrical part is fixedly secured to the main body part. 